How to troubleshoot the high CPU caused by Java application
This article mainly introduces how to troubleshoot too high CPU caused by Java application, which is very detailed and has certain reference value. Friends who are interested must finish reading it!
Use the top command to query the service cpu usage
Server resource utilization
You can see that 31737 of this process has a huge CPU utilization.
Use top-Hp 31737 to query the resource utilization of each thread in the 31737 process
Top-Hp 31737
Use top-Hp 31737 to query the resource utilization of each thread in the 31737 process
31737 Utilization of individual threads in the process
Because the screenshot was lost at that time, to put it simply, using the top-Hp 31737 command to query the 31737 process, a thread id for 5322 takes up too much CPU
Use printf "% x\ n" 5322 to convert thread id to hexadecimal
Printf "% x\ n" 5322
Because the local thread identifies the nid as hexadecimal when printing the thread stack, use this command to convert the thread id to hexadecimal
The hexadecimal of 5322 is 14ca
Use the jstack command to print stack information
Jstack 31737 | grep-10 14ca
Use jstack 31737 | grep-10 14ca to print stack information for 31737 and look for thread stack information identified as 14ca by the local thread
31737 stack information
As shown in the figure, the status of the thread is TIMED_WAITING, and the object is waiting. Check the source code.
The code that has a problem
The cause of the problem will not be analyzed in detail. The main purpose here is to share the process of troubleshooting.
Du Niang, there is a big god answer is right, connected here, interested can take a look at the https://stackoverflow.com/questions/6981564/why-must-the-jdbc-driver-be-put-in-tomcat-home-lib-folder/7198049#7198049
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